The Hamiltonian Friedrichs model [1] describing the evolution of a two-level

system coupled to a continuum is used in order to modelize the decay of the

kaon states K1,K2. Using different cut-off functions ...

In this paper, we use the time-super-operator formalism and the two-level

Friedrichs model to obtain a phenomenological model of mesons decay. Our

approach provides a fairly good estimation of the CP-symmetry ...

The quantum description of the unstable systems is investigated starting from the Schrödinger equation and using Hamiltonian describing discrete levels interacting with a continuum. This approach is applied to kaons decay ...

In the present Letter, we study in the framework of the Friedrichs model the evolution of a two-level system coupled to a continuum. This unitary evolution possesses a non-unitary component with a non-Hermitian effective ...